Review existing snippets in the repository. The goal is to provide a code snippet that demonstrates measuring load time with warm and cold cache. Use `page.setCacheEnabled(false)` to disable cache for cold load, then measure with cache enabled. Include timing via `performance` API. The snippet should be added to the relevant section of the repository.
Snippet: measure warm/cold cache loads · addyosmani/puppeteer-webperf#2 | Good First Issue